Well, the answer is far deeper, think depth rather than the breadth you are describing.
You’re presuming you have access to truth, and that’s because you are coming from a culture that arose from a Christian ethos.
That culture is however being “deconstructed” before your eyes, and if you ask a philosopher at any university today, they’ll explain that there is no objective truth, you can’t really know anything, what is truth? Some might say “my truth” as if it’s relative. But they also can’t answer what a woman is… But if instead you have “faith” that there is objective truth (the truth), dive deep into that and see where it takes you.
What you were originally asking is verification for salvation, which is not a math problem, it’s a relationship with Christ. It’s like asking for verification that you truly love your wife. It’s not math, but it can be verified by anyone taking the time to learn about the relationship and carefully discern the fruits of that relationship.
The “trust me bro” version of salvation is wrong, not biblical, and the truth is a much deeper (and rewarding) question that is very much worth pursuing.